04-12-2017, 04:09 AM
I'm going to have to agree with Klem on this subject. All of my Grendels and most of my 5.56 rifles have adjustable gas blocks. My 18" AA barrel needed the adjustable gas block since it came way over gassed and would not function with out it. The only effect with the increase port erosion, "if there is any" would be in accuracy and I doubt there would be enough compared to the life of the barrel in the first place to be concerned with . I too would like to see some hard evidence since my experience has shown differently. I have not had any problems with carbon welding since I clean and move my adjustment screw periodically. The new AK's have switched to the 90 degree port since they had problems with bullet jacket shearing with the 45 degree port. In any case having the ability to adjust my gas for my loads has out weighed any theory based problem with port erosion.